What a fright! I have enough "room" and have often though of getting horse. But since my pups were not raised around horses, and being rather "playful" I've always been fearful of an accident such as yours! I hope little Patience is OK. If she got knocked in the head, the vomiting may be the result of that. Doggie's get concussions just like humans! Watch to make sure she isn't unusually sleepy. She probably yucked up just from the fright!! Hugs to Patience!